I'm an IDIOT!

[woodyNla]

I just printed the two circuits out as pdf files to post for you. All cucv's are the same except for the M1010. If you do not have a M1010, do not use the page for the M1010 only.

 

[4bogginchevys]

maybe it would be a good idea for you to read the thoery of operation posts below in the thread (can someone explain an Isolated ground). Good luck, hang in there, it all goes together eventually!

 

[Sgt Hulka]

Wow. Few things as vexing as electrical gremlins... Take a breath. Don't experiment. Study the wiring diagrams. Talk to people who know what they're talking about. Isolated ground is no big deal. It simply means the alternator's ground is sent via an "isolated" mount and wire to ground, instead of through the alternator's body via the mounting bolts to ground. Tricky though. Easy to not realize and mess up....

 

[doghead]

gaunt1969, is the ground post the one labeled "NEG"?

yes

 

[gaunt1969]

gaunt1969, is the ground post the one labeled "NEG"?

The ground is the one furthest from the 2wire plug. If the alt was built incorectly and the ground is not isolated it can be used in the alt1 position and move alt one to the alt 2 position.
Alt-1 is wired like most 12V systems, the ground lug goes to the ground post or frame ground on the front battery and pos goes to the pos post on the front battery.
Alt-2 is where the 24V system comes into play. It wires up like your back battery. Look how it is wired up. the ground on the back battery goes to the pos post of the front battery not to frame ground. The Alt-2 does the same, this is why it has to have an isolated ground "HAS TOO" no exceptions. If its ground is grounded to the frame, block, manifold, etc it can cause the batts to blow, you will ineffect short the front battery. Alt-2 pos lug goes to the pos post of the rear battery. The ground lug does go to the ground post of the back battery but remember that post goes to the pos post of the front battery. Thats why if its not isolated "Bad juju"

 

[gaunt1969]

simplified diag of just the pos and neg

 

[sparky1]

The ground is the one furthest from the 2wire plug. If the alt was built incorectly and the ground is not isolated it can be used in the alt1 position and move alt one to the alt 2 position.
Alt-1 is wired like most 12V systems, the ground lug goes to the ground post or frame ground on the front battery and pos goes to the pos post on the front battery.
Alt-2 is where the 24V system comes into play. It wires up like your back battery. Look how it is wired up. the ground on the back battery goes to the pos post of the front battery not to frame ground. The Alt-2 does the same, this is why it has to have an isolated ground "HAS TOO" no exceptions. If its ground is grounded to the frame, block, manifold, etc it can cause the batts to blow, you will ineffect short the front battery. Alt-2 pos lug goes to the pos post of the rear battery. The ground lug does go to the ground post of the back battery but remember that post goes to the pos post of the front battery. Thats why if its not isolated "Bad juju"

much thanks for explaining that,its been driving me nuts for years.i'll have to read it a number of times to fully understand.thanks again